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    my $regex = qr /(              # Start capture
                \(              # Start with '(',
...
                )*              # zero or more times
                \)              # Close capture
                )/x;            # Ending with ')'
  2. or download this
    my $regex = qr /(              # Start capture
                \(              # Start with '(',
...
                )*              # zero or more times
                \)              # Close capture
                )/x;            # Ending with ')'